Replacing SPI SST25WF040 component on T4240QDS

Folks, the documentation is unclear to me on the use of this device. Section 2.10 of the T4240QDS_RM_V9.1_130604.pdf states that this is a SPI EEPROM device and further states that "Other devices and chip selects can be evaluated by replacing the device and re-wiring the board". Looking up the data sheet for the component in question, this is labeled as a 1.8 V Serial Flash. What I don't know is: (1) is this chip needed for any boot processes or critical board operations by design, or is this a completely optional part which can be removed with no ill effects? (2) If I replace this part, must I replace it with a similar component, or can I place any SPI 1.8V compatible component in its place? (3) When the documentation refers to rewiring the board, does this mean simply desoldering the SST25WF040 and soldering a new pin-matched component in its place?